Stochastic orders and shape properties for a new distorted proportional odds model (Preprint)

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Type: Preprint
National /International: International
Title: Stochastic orders and shape properties for a new distorted proportional odds model
Publication Date: 2024-11-06
Authors: - Idir Arab
- Milto Hadjikyriakou
- Paulo Eduardo Oliveira
Abstract:

Building on recent developments in models focused on the shape properties of odds ratios, this paper introduces two new models that expand the class of available distributions while preserving specific shape characteristics of an underlying baseline distribution. The first model offers enhanced control over odds and log-odds functions, facilitating adjustments to skewness, tail behavior, and hazard rates. The second model, with even greater flexibility, describes odds ratios as quantile distortions. This approach leads to an enlarged log-logistic family capable
of capturing these quantile transformations and diverse hazard behaviors, including non-monotonic and bathtub-shaped rates. Central to our study are the shape
relations described through stochastic orders; we establish conditions that ensure stochastic ordering both within each family and across models under various ordering concepts, such as hazard rate, likelihood ratio, and convex transform orders.

Institution: DMUC 24-46
Online version: http://www.mat.uc.pt...prints/eng_2024.html
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